F30 320d timing chain rattle on cold start - normal or should I worry?

about 1 month ago· 13 posts

Hey guys, got a 2014 F30 320d with about 130k km on it. For the past few weeks ive been hearing this metalic rattle on cold starts that goes away after like 30 seconds. Its coming from the front of the engine area. Is this the timing chain stretching? I read online that the N47 engine has issues with the chain but mine is the B47 (2014 LCI). Should I be worried or is this just normal cold start noise? Any advice appreciated, dont want to blow the engine lol

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Replies (4)

DieselChip

about 1 month ago#1

Thats pretty common on the B47 actually. The chain tensioner takes a moment to build oil pressure on cold start. If it goes away within 30-60 seconds its usually fine. But keep an eye on it. If it starts lasting longer or you hear it when warm, get it checked asap. The B47 is way better than the N47 for chain issues but its not immune.

19 posts · 0 rep

BavarianGarage

about 1 month ago#2

I work on these daily. 130k km is getting up there for the B47. I'd recommend getting the chain checked with ISTA - you can see the chain elongation values. If its within spec youre fine, if its borderline I'd plan for a replacement. Budget around 1500-2000 EUR for the job at an indie shop.

25 posts · 0 rep

BimmerFreak

about 1 month ago#3

Thanks both. I'll get it scanned this weekend. Hopefully its just the tensioner being slow. The car runs perfectly otherwise, no loss of power or anything weird.

13 posts · 0 rep

Torque Addict

about 1 month ago#4

had the exact same thing on my 2015 320d. turned out to be nothing, just cold start rattle. 160k km now and still going strong. these B47s are solid engines if you keep up with oil changes

13 posts · 0 rep

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